The Ghostly Horses also manifested in Tombstone, Arizona some time after Wyatt Earp. Like their owners, these ghosts were mostly invisible unless they wanted to be seen but could easily be sighted from the location of their physical horseshoes. Peter Venkman stumbled upon them and laid down four Traps in anticipation of the Earp Gang needing the horses. Sure enough, the Earp Gang boarded their horses and were captured.